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Ti-modified NiAl-Cr(Mo) polyphase eutectic intermetallic compound

A new type of intermetallic compound and crystal technology, which is applied in the field of Ti-modified NiAl-Cr multi-phase eutectic new structure intermetallic compound, can solve the problem of low strength at high temperature and achieve good mechanical properties

Inactive Publication Date: 2007-05-30
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current research shows that in the state of multi-phase alloy, compared with the NiAl alloy with equiatomic ratio, the Ni-rich NiAl alloy has good room temperature plasticity, such as: foreign Ishida et al. added the third element Co to Ni-rich NiAl , Cu, its composition is Ni-26Al-50Co, Ni-24Al-30Cu, its tensile plasticity at room temperature reaches 10.2%, 2.5% respectively, but the high temperature strength is low

Method used

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  • Ti-modified NiAl-Cr(Mo) polyphase eutectic intermetallic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of Ni-28Al-30Cr-4Mo-5Ti intermetallic compound

[0028] According to the nominal composition of Ni-28Al-30Cr-4Mo-5Ti (atomic percentage), the raw materials are all 99.999% pure.

[0029] Use non-consumable vacuum electric arc furnace to smelt Ni-28Al-30Cr-4Mo-5Ti alloy ingots with a vacuum degree greater than 5×10 -3 Pa, smelting temperature 3000 ℃, refining 4 times, the raw materials can be smelted uniformly.

[0030] The prepared intermetallic compound rods are kept in a high temperature heat treatment furnace at 1200°C for 12 hours and then cooled to room temperature along with the furnace.

[0031] A wire cutting method was used to cut a cylindrical sample with a diameter of 6mm and a height of 9mm and a square cylinder of 6mm×6mm×30mm from the heat-treated Ni-28Al-30Cr-4Mo-5Ti ingot for mechanical performance testing.

[0032] Using 1111 type accuracy is 10 -4 The g electronic balance measures the mass M of the sample with an accuracy of 10 -2 ...

Embodiment 2

[0034] Example 2: Preparation of Ni-16Al-30Cr-4Mo-17Ti intermetallic compound

[0035] According to the nominal composition of Ni-16Al-30Cr-4Mo-17Ti (atomic percentage), the raw materials are all 99.999% pure.

[0036] Use non-consumable vacuum arc furnace to smelt Ni-16Al-30Cr-4Mo-17Ti alloy ingots with a vacuum degree greater than 5×10 -3 Pa, smelting temperature 2700℃, smelting 6 times, the raw materials can be smelted uniformly.

[0037] The prepared intermetallic compound rods are kept in a high temperature heat treatment furnace at 1200°C for 12 hours and then cooled to room temperature along with the furnace.

[0038] The test conditions of the mechanical properties of the Ni-16Al-30Cr-4Mo-17Ti intermetallic compound are the same as those in Example 1, and the density is 6.32g / cm 3 The yield strength at room temperature is 2200MPa, and the compressive plasticity is greater than 35%; the yield strength at 600°C is 1200MPa, and the compressive plasticity is greater than 50%;...

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Abstract

The invention discloses a new-typed structure metal compound of Fe modified NiAl-Cr (Mo) polyphase eutectic crystal, which comprises the following parts: 33at% Ni,30at% Cr,4at% Mo,3-17at% Fe and Al, wherein the NiAl-Cr (Mo) polyphase alloy is modified by Fe, which induces plastic third phase gamma-phase and gamma'-phase to improve high-temperature strength and indoor temperature flexibility and plasticity.

Description

Technical field [0001] The invention relates to a Ti-modified NiAl-Cr(Mo) multiphase eutectic new structure intermetallic compound. Background technique [0002] At present, in the industrial fields of power, petrochemical, transportation, especially aviation and aerospace, the metal structural materials used above 600°C are usually nickel-based, iron-based and cobalt-based superalloys. These materials have a higher density (generally at 8.0g / cm 3 Above), the components and equipment made are heavy. In order to reduce the structural weight, improve efficiency, and reduce energy consumption, it is necessary to develop new low-density, high-strength high-temperature alloys to meet the needs of future development in related industrial fields. What is more urgent is that the current high temperature alloys represented by Ni and Co bases are close to the limit temperature of their use due to the limitation of melting point. Even the third-generation superalloy single crystal with a la...

Claims

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Application Information

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IPC IPC(8): C22C30/00
Inventor 徐惠彬张志刚宫声凯刘先斌汤林志
Owner BEIHANG UNIV
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